Description
2.5 Standards and guidelines
3VA molded case circuit breakers
62 Manual, 04/2015, A5E03603177010-02
When 3VA1 and 3VA2 molded case circuit breakers are used at up to 2000 m above sea
level, the rated data will not change.
An installation altitude above 2000 m can lead to higher temperatures at the switching
devices. The lower density of air can significantly reduce heat dissipation,
making it necessary to decrease rated operational voltage, the rated uninterrupted current
and the short-circuit values.
Refer to the table below for the calculation factor for determining the key values:
1)
At maximum ambient temperature +50 °C
2)
Thermal-magnetic trip units only
Permissible mounting positions
The permissible mounting positions for 3VA molded case circuit breakers are illustrated
below:
Vertical wall mounting
Ceiling mounting
Floor mounting
Laterally rotated wall mounting
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